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552432
Plate tectonics
Descripción
Mapa Mental sobre Plate tectonics, creado por sophie.blaker el 15/02/2014.
Mapa Mental por
sophie.blaker
, actualizado hace más de 1 año
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sophie.blaker
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Resumen del Recurso
Plate tectonics
Replaced idea of continental drift
1950s and 1960s
7 large sections called plates
A few smaller sections called plates
Convection currents
Caused by the intense heat in the mantle
Causes the plates to move
Plate boundaries
Where two plates meet
Slow movement of the plates
Forms volcanoes and new mountains
Makes earthquakes and tsunamis
Constructive plate boundary
Where two plates are moving apart (diverging)
New crust is made
Hot magma from the mantle rises to fill the gap
Creates new mountains under the sea
Mid oceanic ridge
When new magma continues to build up above the ocean
New volcanic island are made
Destructive plate boundary
Two plates move together (continental and oceanic)
Denser continental plate is forced down (subducted) underneath the less dense oceanic crust
creates an ocean trench and causes the material to melt as it is dragged down
The magma rises through cracks as a very violent volcano
Earthquakes
Conservative plate boundary
Plates meet and slide past eachother
No crust is destroyed or added
Sliding movement is not smooth and immense friction builds up
Eventually one plate suddenly jerks past the other causing shockwaves and an earthquake on the surface
Faults are found here due to the plates moving in different directions
Collision plate boundary
Two continential plates bump into eachother
Both plates are continental so they buckle and fold
Pushes up the land to create fold mountains
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